Updated to use the new feature of WebPConvert, that it can detect quality of source files.
So instead of a "quality"-setting, we now have a "max quality" setting.
Also pulled in updates in WebPConvertAndServe, which utilizes the improved reporting capabilities of WebPConvert - to create more detailed reports.
Also added information about the converters in their settings dialogs.
And finally - prepared the plugin for submission to the Wordpress directory: Updated readme, added screenshots, etc.
I was a bit in a hurry to get this ready for submission before the holidays. So it is unfortunately not tested thoroughly. Sorry about that.